HeartSaVioR commented on issue #23850: [SPARK-26949][SS] Prevent 'purge' to 
remove needed batch files in CompactibleFileStreamLog
URL: https://github.com/apache/spark/pull/23850#issuecomment-466173672
 
 
   Thanks @gaborgsomogyi for providing your opinion. Same here, and that's why 
I took this approach and left such approaches as alternatives.
   
   > If it would be really required I think the compacted file can be 
deserialized => remove the batches => serialized again with proper content 
(maybe you meant the same by `maintain logs`).
   
   What I meant by `maintain logs` is compaction what CompactibleFileStreamLog 
is doing now. IMHO instrumenting latest compacted batch doesn't seem to be an 
alternative, because we can't find which entries were added before 
thresholdBatchId once batches were compacted.

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